Anti-Ice, RAin Flashcards
Window OVERHEAT lights (amber)
overheat condition is detected
Window heat OFF light (amber)
switch is off
overheat detected
system failure
system is at correct temperature
Window heat ON (green)
if illuminated green, heat is being applied to selected window
if extinguished:
switch is OFF or
overheat is detect OR
system failure OR
system is at correct temp
WINDOW HEAT TEST switch
OVHT- simulates overheat condition
PWR test- provides confidence test
Probe Heat lights (amber)
related probe not heated
these do not indicate system status if on standby power
PROBE HEAT Switches (ON, AUTO)
On- power is supplied to related system
AUTO- power automatically applied to A and B when either engine is running
COWL ANTI ICE (amber)
overpressure condition in duct downstream of cowl A/I valve
COWL VALVE OPEN lights
bright blue- related cowl anti ice valve in transit or position disagrees with switch position
dim blue- cowl anti ice valve open
extinguished-cowl anti ice valve closed
Engine Anti Ice switch
On- related cowl anti ice valve open and stick shaker logic is set for icing conditions. Green TAI on engine display
OFF- related cowl anti ice valve closed and stick shaker locigc returns to normal if wing A/I hasnt been used. Green TAI on engine display goes away
Wing Anti Ice VALVE OPEN lights
Bright blue- wing anti ice valve is in transit or not in commanded position
dim blue- wing anti ice control valve open
Extinguished- wing anti ice control valve closed
Wing anti ice switch
OFF- wing anti ice control valves closed
ON (in air)- wing anti ice control valve opens and stick shaker logic set for icing (will remain in that logic for rest of flight)
ON (on ground)-
- wing anti ice control valves open if thrust on both engines is below takeoff warning setting and temp inside distribution ducts is below thermal switch activation temp
- control valves will close if either engine thrust is above takeoff warning setting or theral switch is activated (switch remains on)
- switch trips OFF at lift off
the FWD window switch control heat to which window?
1
t
the SIDE window HEAT switches control heat to which windows?
2 and 3
Temp controllers maintain heat to windows 1 and 2 for max strength of windows in case of bird strike. Power to window 1 and 2 is automatically removed if:
an overheat condition is detected
Thermal switches are located on window 3. How do they maintain correct temp?
they open and close
